ASTM A-653 (14 ga. and heavier, Commercial Quality)
ASTM A-653 (16 ga. and lighter, Lock-forming Quality)
Galvanized sheets are continuously hot-dipped with a protective
coating of zinc. Coating is G90 (.90 oz per square foot). Galvanized
sheets can be formed, rolled or otherwise fabricated at room temperature
without disrupting their protective qualities. Applications include
heating and ventilation ducts, roof flashing, electrical boxes.
Many general maintenance applications.